[java] Setting language level to 11 in IDEA project to allow new features in tests, let bazel control Java 8 conformance in the main subtree.

Author: barancev

java/java.iml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_11">
     <output url="file://$MODULE_DIR$/build/production" />
     <output-test url="file://$MODULE_DIR$/build/test" />
     <exclude-output />